Selective dissolution of the γ phase in a binary Ni(γ)/Ni3Al(γ′) two-phase alloy

Selective dissolution of amorphous Zr–Cu–Ni–Al alloys

“…For producing attractive for various applications micro-and nanoporous structures different types of alloys have been used: two-phase crystalline alloys [7,[11][12][13][14][15][16][17][18][19] single phase solid solutions [10,[20][21][22] as well as fine nanocrystalline and amorphous alloys [4][5][6]14,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. To form uniform nanoporosity upon dealloying, an alloy system is required to be a monolithic phase because the nanoporosity is formed by a self-assembly process through surface diffusion, not by the simple excavation of one phase from a pre-separated multiphase system [28].…”

Lamellar Ni3Si Microchannels and Ni3Si Micropore Arrays in Ni─Ni3Si Hypereutectic Alloys

“…7c) can be divided into four peaks, namely, those at 529.8, 531.4, 532.4, and 533.6 eV, corresponding to the NiO, Ni(OH) 2 , SiO 2 , and adsorbed O 2 , respectively. 17 The main oxides on the surface of the lamellar Ni 3 Si microchannels were SiO 2 and Ni(OH) 2 . SiO 2 is a highly stable oxide and does not undergo corrosion during selective dissolution.…”

“…The particles were cuboidal in shape, appearing similar to the Ni 3 Al particles of Ni/Ni 3 Al two-phase alloy. 17 An EDS detection showed that the cuboidal particles were β-Ni 3 Si embedded in α-Ni phase matrix with <1 μm in edge length.…”

A first-principles phase field method for quantitatively predicting multi-composition phase separation without thermodynamic empirical parameter

“…1 (heat-treated at 1350 °C) of ref. 22 , both for Ni 82%, in terms of its size, and estimated our length scale as Δ x ≅ 0.03 μm. With this value we estimate ε X to be 8.9 × 10 −11 Jm −1 (see Supplementary Note 1), which is comparable to the gradient energy coefficient used in the previous phase field calculation on Ni–Al alloys 23 .…”